A highly diastereoselective series of Nicholas cyclisation reactions of N-Boc-protected propargylamines
摘要:
The reaction of N-Boc-protected propargylamine with salicylaldehyde derivatives and their subsequent Nicholas cyclisation reaction to provide a range of novel benzopyrans is reported. The cyclisation reactions proceeded with excellent levels of diastereoselectivity to afford compounds with cis-relative stereochemistry. As far as we are able to ascertain these are the first reported examples of Nicholas cyclisation reactions of propargyl alcohols that bear a terminal alkynyl N-protected amino motif. (C) 2012 Elsevier Ltd. All rights reserved.
A highly diastereoselective series of Nicholas cyclisation reactions of N-Boc-protected propargylamines
摘要:
The reaction of N-Boc-protected propargylamine with salicylaldehyde derivatives and their subsequent Nicholas cyclisation reaction to provide a range of novel benzopyrans is reported. The cyclisation reactions proceeded with excellent levels of diastereoselectivity to afford compounds with cis-relative stereochemistry. As far as we are able to ascertain these are the first reported examples of Nicholas cyclisation reactions of propargyl alcohols that bear a terminal alkynyl N-protected amino motif. (C) 2012 Elsevier Ltd. All rights reserved.
In situ mechanochemical synthesis of nitrones followed by 1,3-dipolar cycloaddition: a catalyst-free, “green” route to cis-fused chromano[4,3-c]isoxazoles
作者:Zigmee T. Bhutia、Geethika P.、Anurag Malik、Vikash Kumar、Amrita Chatterjee、Biswajit Gopal Roy、Mainak Banerjee
DOI:10.1039/c5ra21044e
日期:——
An efficient, catalyst free mechanochemical route to cis-fused chromano[4,3-c]isoxazoles has been developed via a simple mortar-pestle grinding method.
The synthesis and biological evaluation of a range of novel functionalised benzopyrans as potential potassium channel activators
作者:Elizabeth Tyrrell、Kibur Hunie Tesfa、Iain Greenwood、Alistair Mann
DOI:10.1016/j.bmcl.2007.11.135
日期:2008.2
A range of novel benzopyrans have been synthesised and biologically evaluated for K-ATP channel activity employing cromakalim 1 as a benchmark K-ATP channel opener. Although the compounds that were evaluated demonstrated a reduced ability to relax phenylephrine stimulated rat thoracic tissue, we provide evidence that benzopyrans 7a-h may be operating via an alternative mechanism than ATP-sensitive K+ channel activity. (C) 2008 Published by Elsevier Ltd.
A highly diastereoselective series of Nicholas cyclisation reactions of N-Boc-protected propargylamines
The reaction of N-Boc-protected propargylamine with salicylaldehyde derivatives and their subsequent Nicholas cyclisation reaction to provide a range of novel benzopyrans is reported. The cyclisation reactions proceeded with excellent levels of diastereoselectivity to afford compounds with cis-relative stereochemistry. As far as we are able to ascertain these are the first reported examples of Nicholas cyclisation reactions of propargyl alcohols that bear a terminal alkynyl N-protected amino motif. (C) 2012 Elsevier Ltd. All rights reserved.